RO pretreatment filter MWCO: 5k-500k Dalton Material:PVC,PAN,PVDF, ... PP,PS,PES Dia:4",6",8",10" Casing:UPVC,SS,FRP RO ... pretreatment with Ultra filtration membrane water filtering filter for water treatment with different membrane ... Time15-120minsChemicalsCitric acid,NaOH / NaClO,H2O2 UF membrane filter for pretreatment of RO